3rd Edition

ISBN: 9781265787219

Author: Navidi

Publisher: MCG

Concept explainers

Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could co…

Normal Distribution

Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a…

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Textbook Question

Chapter 7.3, Problem 21E

How’s your mileage? The Environmental Protection Agency (EPA) rates the mean highway gas mileage of the 2017 Chevrolet Sonic to be 28 miles per gallon. Assume the standard deviation is 3 miles per gallon. A rental car company buys 60 of these cars.

What is the probability that the average mileage of the fleet is greater than 27.5 miles per gallon?
What is the probability that the average mileage of the fleet is between 27 and 27.8 miles per gallon?
Would it be unusual if the average mileage of the fleet were less than 27 miles per gallon?

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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Chapter 7.3, Problem 20E

Chapter 7.3, Problem 22E

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Chapter 7 Solutions

ELEMENTARY STATISTICS-ALEKS ACCESS CODE

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